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diff --git a/src/spdk/doc/template_pg.md b/src/spdk/doc/template_pg.md new file mode 100644 index 00000000..535a980c --- /dev/null +++ b/src/spdk/doc/template_pg.md @@ -0,0 +1,80 @@ +# ComponentName Programmer's Guide {#componentname_pg} + +# In this document {#componentname_pg_toc} + +@ref componentname_pg_audience +@ref componentname_pg_intro +@ref componentname_pg_theory +@ref componentname_pg_design +@ref componentname_pg_examples +@ref componentname_pg_config +@ref componentname_pg_component +@ref componentname_pg_sequences + +## Target Audience {#componentname_pg_audience} + +This programmer's guide is intended for developers authoring applications that utilize the SPDK <COMPONENT NAME>. It is +intended to supplement the source code to provide an overall understanding of how to integrate <COMPONENT NAME> into +an application as well as provide some high level insight into how <COMPONENT NAME> works behind the scenes. It is not +intended to serve as a design document or an API reference but in some cases source code snippets and high level +sequences will be discussed. For the latest source code reference refer to the [repo](https://github.com/spdk). + +## Introduction {#componentname_pg_intro} + +Provide some high level description of what this component is, what it does and maybe why it exists. This shouldn't be +a lengthy tutorial or commentary on storage in general or the goodness of SPDK but provide enough information to +set the stage for someone about to write an application to integrate with this component. They won't be totally +starting from scratch if they're at this point, they are by definition a storage application developer if they are +reading this guide. + +## Theory of Operation {#componentname_pg_theory} + +Create subsections here to drill down into the "how" this component works. This isn't a design section however so +avoid getting into too many details, just hit the high level concepts that would leave the developer with a +50K foot overview of the major elements/assumptions/concepts that should have some baseline knowledge about before +they start writing code. + +Some questions to consider when authoring this section: + +* What are the basic primitives that this component exposes? +* How are these primitives related to one another? +* What are the threading rules when using these primitives? +* What are the theoretical performance implications for different scaling vectors? +* Are there any other documents or specifications that the user should be familiar with? +* What are the intended use cases? + +## Design Considerations {#componentname_pg_design} + +Here is where you want to highlight things they need to think about in *their* design. If you have written test code +for this module think about the things that you needed to go learn about to properly interact with this module. Think +about how they need to consider initialization options, threading, limitations, any sort of quirky or non-obious +interactions or module behaviors that might save them some time and effort by thinking about before they start their +design. + +## Examples {#componentname_pg_examples} + +List all of the relevant examples we have in the repo that use this module and describe a little about what they do. + +## Configuration {#componentname_pg_config} + +This section should describe the mechanisms for configuring the component at a high level (i.e. you can configure it +using a config file, or you can configure it using RPC calls over a unix domain socket). It should also talk about +when you can configure it - i.e. at run time or only up front. For specifics about how the RPCs work or the config +file format, link to the appropriate user guide instead of putting that information here. + +## Component Detail {#componentname_pg_component} + +This is where we can provide some design level detail if it makes sense for this module. We don't want to have +design docs as part of SPDK, the overhead and maintenance is too much for open source. We do, however, want +to provide some level of insight into the codebase to promote getting more people involved and understanding +of what the design is all about. The PG is meant to help a developer write their own application but we +can use this section, per module, to test out a way to build out some internal design info as well. I see +this as including an overview of key structures, concepts, etc., of the module itself. So, interesting info +not required to write an application using the module but maybe just enough to provide the next level of +detail into what's behind the scenes to get someone more interested in becoming a community contributor. + +## Sequences {#componentname_pg_sequences} + +If sequence diagrams makes sense for this module, use mscgen to create simple UML-style (they don't need to be 100% +UML compliant) diagrams for the API that an application needs to interact with. Details internal to the component +should not be included. |